Automatic train-stop



W. E. WALSH.

--AUTOMAT|C TRAIN STOP.

APPLICATION FILED DEC.26, I918.

Patented J an. 27, 1920;

2 SHEETS-SHEET I.

INVENTOR aw/MA W. E. WALSH. AUTOMATIQ TRAIN STOP.

APPLICATION FILED DEC.26, l9l8.

Patented J an. 27, 1920.

2 SHEETS-SHEET 2- 7; Jay/20,1 7514a INVENTOR Aka; ma

UNITED STATES PATENT QFFICE.

VL ILLIAIVI EDIVABD WALSH, 0F NEV] HAVEN, CONNECTICUT.

AUTOMATIC TRAIN-STOP.

Application filed December 26, 1918.

To all whom it may concern:

Be it known that I, IVILLIAM EDWARD WALsrr, a citizen of the UnitedStates, residing at New Haven, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in AutomaticTrain-Stops; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the characters ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this application,and represent, in-

Figure 1 a perspective view of my improved train-stop mechanism showingthe operating lever in the raised position.

Fig. 2 a broken perspective view showing the emergency air-tank andconduit to air governor as arranged below the floor of the engine cab.

Fig. 3 a perspective view of the-operating mechanism with the lever in t-e closed position or position after passing a dang-e signal.

Fig. 4 a top or plan view of the locking hook for holding the lever inits lowered position.

Fig. 5 a sectional view on the line aa of Fig. 4.

Fig. 6 a perspective view of the operating cam at signal points.

Fig. 7 a similar view with the operating cam in the raised position.

This invention relates to an improvement in automatic train stops, andparticularly to automatic stops which are adapted to be operated atsignal points by means of mechanism operated from a signal tower, andwhich, when the track is clear, may be passed without hindrance, andwhich if the signal is set will operate the air brake mechanism to bringa train to a stop.

The object of the invention is to provide simple and effective means foroperating the brake mechanism in case the engineer fails to obey thedanger signal set against him; and the invention consists in the con.-struction hereinafter described and particularly recited in the claims.

In carrying out my invention I employ a one-way valve 1 which isconnected to a plate 2 secured by bolts 3 to a metal flash block 1fastened to the roof of an engine cab, the size of this block beingdetermined Specification of Letters Patent.

Serial No. 268,333.

by the height to which th device is to eX- tend above the cab roof.Connected wit the plate 2 are two steel posts 55 in the upper ends ofwhich are rearwardly er:- tending stops 66. Connected with the valveshaft 10 projecting at opposite sides of the valve 1 are lever arms 7the outer ends of which are connected by a pin 11 upon which the wheel12 is mounted for the purpose as will hereinafter appear. Connected withthe lever 7 and with the posts 5 are springs 8 the tendency of which isto draw the levers against the ends of the stops 6. The valve 1 isconnected by means of a pipe at one end with the main train line andwith a pipe from the other end to the emergency air tank 13 which isprovided with an automatic reducing valve 1%, this emergency tank beingsecured to the underside of the floor of the engine cab by means ofstraps 15. In the normal position the lever arm 7 stands upright so asto present a roller 12 in the line with a cam plate 21 connected byangle irons 22 with a beveled frame 23 which in turn is connected byhinges 25 with a fixed beam 21 arranged at a signal point. This camplate 21 may be swung into or out of the path of the roller 12 by meansof wires 26, from a signal tower running over pulleys 27 mounted in atransverse plate 28 riveted to the beam 24. When the signal is clear thecam 21 is thrown upward as indicated in Fig. 7 of the drawings so thatthe roller 12 will pass without obstruction. In case of danger the camplate will be swung down, as shown in Fig. 6 of the drawings, so as tostand in the path of the roller 12 which will contact with the cam plateand be thrust down into the position shown in 3, and this movement ofthe levers opens the valve 1 and automatically applies the brakes. Asthe lever arms 7 are depressed they are engaged by a hook 16 pivotallymounted in a plate 17 which rests upon a block 18 in order to properlyplace it. This hook 16 rests against a stop 19 and is provided with ahandle in position to be operated by the engineer, the movement of thehook in opening being against the tension of a spring 20 which normallyacts to hold the hook against the stop 19. In case the engineer fails toobserve a signal set against him the valve will be operated to set thebrakes and the valveoperating mechanism will be locked until released bythe engineer operating the hook 16 to free the lever arm 7 which willagain rise.

I claim 1. The combination with a valve with connection to the maintrain line and an emergency air tank, of lever arms connected with thevalve for operating the same, a roller connected with the outer ends ofsaid lever arms, stops to limit the upward movement of said lever arms,springs normally tending to draw the lever arms against said stops,means for holding the lever arms in the depressed position, and acam-plate adapted to be turned into the path of the said roller.

2. An automatic train stop comprising a valve, connections between thevalve and the main train line and to an emergency air tank, lever armsconnected with said valve,

a roller mounted in the ends of said lever arms, springs normallytending to hold the lever arms in a vertical position, a hook adapted toengage with one of said lever arms when in the depressed position, andan inclined cam plate adapted to be swung into or out of the path ofsaid roller.

3. An automatic train stop comprising a valve, a plate on which thevalve is mounted, posts connected with said plate, stops connected withthe upper ends of said post-s, lever arms operating said valve andarranged in the path of said stops, a roller mounted between the outerends of said lever arms, means for locking the levers in the depressedposition, and an inclined cam plate arranged to be swung into or out ofthe path of said roller.

WILLIAM EDWARD WALSH.

